package org.seckill.service.impl;

import org.seckill.dao.SeckillDao;
import org.seckill.dao.SuccessKilledDao;
import org.seckill.dao.cash.RedisDao;
import org.seckill.dto.Exposer;
import org.seckill.dto.SeckillExecution;
import org.seckill.entity.Seckill;
import org.seckill.entity.SuccessKilled;
import org.seckill.enums.SeckillStateEnum;
import org.seckill.exception.RepeatKillException;
import org.seckill.exception.SeckillCloseException;
import org.seckill.exception.SeckillException;
import org.seckill.service.SeckillService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.DigestUtils;

import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Created by SliverZhang on 2017/11/2.     右键->goto->Test
 */
//  @Component  @Service    @Controler  @Dao
// 所有组件（当你不知道他是一个DAO Controller Service 的时候）
@Service
public class SeckillServiceImpl implements SeckillService {
    Logger logger = LoggerFactory.getLogger(this.getClass());
    //  注入  Service 依赖
    @Autowired
    private RedisDao redisDao;
    @Autowired
    private SeckillDao seckillDao;
    @Autowired
    private SuccessKilledDao successKilledDao;
    //  md5 盐值字符串 用于混淆  md5
    private final String slat = "fsafksdlajfkljsafdlkjkfkasjsdfklj";

    @Override
    public List<Seckill> getSeckillList() {
        return seckillDao.queryAll(0, 4);
    }

    @Override
    public Seckill getById(long seckillId) {
        return seckillDao.queryById(seckillId);
    }

    @Override
    public Exposer exportSeckillId(long seckillId) {
        //优化点：缓存优化
        /*      get from cash
        *       if null
        *        get db
        *       else
        *       put cash
        * */
        Seckill seckill = redisDao.getSeckill(seckillId);
        if (seckill == null){
            seckill = seckillDao.queryById(seckillId);
            if (seckill == null){
                return new Exposer(false, seckillId);
            }else {
                redisDao.putSeckill(seckill);
            }
        }

        Date startTime = seckill.getStartTime();
        Date endTime = seckill.getEndTime();
        //  当前时间
        Date nowTime = new Date();

/*      System.out.println(startTime.getTime());
        System.out.println(nowTime.getTime());
        System.out.println(endTime.getTime());*/
        if (nowTime.getTime() < startTime.getTime() || nowTime.getTime() > endTime.getTime()) {
            return new Exposer(false, seckillId, nowTime.getTime(), startTime.getTime());
        }
        //转换特定字符串的过程,不可逆
        String md5 = getMD5(seckillId);  //TODO
        System.out.println(md5);
        return new Exposer(true, md5, seckillId);
    }

    private String getMD5(long seckillId) {
        String base = seckillId + "/" + slat;
        //工具类生成 md5
        String md5 = DigestUtils.md5DigestAsHex(base.getBytes());
        return md5;
    }

    @Override
    @Transactional
    /*  编译异常 和 运行时异常
        spring 的声明时事务 只会运行时异常做回滚
    *  使用注解控制事务方法的有点：
    *  1：开发团队达成一致约定，明确标注事务方法的编程风格。
    *  2：保证事务方法的执行时间尽可能短，不要穿插其他网络操作，RPC/HTTP请求 或者 剥离到事务方法外部
    *  3：不是所有的方法都需要事务，如只有一条修改操作，只读操作不需要事务控制
    * */
    public SeckillExecution executeSeckill(long seckillId, long userPhone, String md5)
            throws SeckillException, RepeatKillException, SeckillCloseException {

        if (md5 == null || !md5.equals(getMD5(seckillId))) {
            throw new SeckillException("seckill data rewrite");
        }
        //  执行秒杀逻辑： 减库存 +   记录秒杀行为
        Date nowTime = new Date();
        try {
            //记录购买行为
            int insertCount = successKilledDao.insertSuccessedKilled(seckillId, userPhone);
            if (insertCount <= 0) {
                //重复秒杀
                throw new SeckillException("seckill repeated!");
            } else {
                //  记录购买行为
                int updateCount = seckillDao.reduceNumber(seckillId, nowTime);
                if (updateCount <= 0) {
                    //没有更新到记录 秒杀结束，rollback
                    throw new RepeatKillException("seckill is closed");
                } else {
                    //  秒杀成功 commit
                   /* Map map = new HashMap();
                    map.put("seckilledId",seckilledId);*/
                    SuccessKilled successKilled = successKilledDao.queryByIdWithSeckill(seckillId, userPhone);
                    return new SeckillExecution(seckillId, SeckillStateEnum.SUCCESS);
                }
            }
        }catch (SeckillCloseException e1){
            throw e1;
        }catch (RepeatKillException e2){
            throw e2;
        }
        catch (SeckillException e) {
            logger.error(e.getMessage(),e);
            //  所有编译期异常 转化为运行期异常        Spring 可以帮助我们做  rollback
            throw new SeckillException("seckill inner error:"+e.getMessage());
        }
    }

    @Override
    public SeckillExecution executeSeckillProcedure(long seckillId, long userPhone, String md5) {
        if (md5 == null || !md5.equals(getMD5(seckillId))) {
            return new SeckillExecution(seckillId,SeckillStateEnum.DATA_REWRITE);
        }

        Date killTime = new Date();
        Map map = new HashMap<>();
        map.put("seckillId",seckillId);
        map.put("phone",userPhone);
        map.put("killTime",killTime);
        map.put("result",null);
        //执行存储过程，result 被赋值
        seckillDao.killByProcedure(map);
        return null;// TODO: 2017/12/2
    }

}
